/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shardingsphere.data.pipeline.mysql.ddlgenerator;

import org.apache.shardingsphere.data.pipeline.core.exception.syntax.CreateTableSQLGenerateException;
import org.apache.shardingsphere.data.pipeline.spi.ddlgenerator.CreateTableSQLGenerator;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collection;
import java.util.Collections;

/**
* Create table SQL generator for MySQL.
 */
public final class MySQLCreateTableSQLGenerator implements CreateTableSQLGenerator {
    
    private static final String SHOW_CREATE_SQL = "SHOW CREATE TABLE %s";
    
    private static final String COLUMN_LABEL = "create table";
    
    @Override
    public Collection<String> generate(final DataSource dataSource, final String schemaName, final String tableName) throws SQLException {
        try (
                Connection connection = dataSource.getConnection();
                Statement statement = connection.createStatement();
                ResultSet resultSet = statement.executeQuery(String.format(SHOW_CREATE_SQL, tableName))) {
            if (resultSet.next()) {
                return Collections.singletonList(resultSet.getString(COLUMN_LABEL));
            }
        }
        throw new CreateTableSQLGenerateException(tableName);
    }
    
    @Override
    public String getDatabaseType() {
        return "MySQL";
    }
}
